EP0387750A1 - Dispositif de traitement électrolytique - Google Patents

Dispositif de traitement électrolytique Download PDF

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Publication number
EP0387750A1
EP0387750A1 EP90104624A EP90104624A EP0387750A1 EP 0387750 A1 EP0387750 A1 EP 0387750A1 EP 90104624 A EP90104624 A EP 90104624A EP 90104624 A EP90104624 A EP 90104624A EP 0387750 A1 EP0387750 A1 EP 0387750A1
Authority
EP
European Patent Office
Prior art keywords
electrolyte
electrolytic treatment
treatment apparatus
counter electrodes
metal web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90104624A
Other languages
German (de)
English (en)
Other versions
EP0387750B1 (fr
Inventor
Nobuyoshi C/O Fuji Photo Film Co. Ltd. Kaneko
Tsutomu C/O Fuji Photo Film Co. Ltd. Kakei
Atsushi C/O Fuji Photo Film Co. Ltd. Matsuura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0387750A1 publication Critical patent/EP0387750A1/fr
Application granted granted Critical
Publication of EP0387750B1 publication Critical patent/EP0387750B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer

Definitions

  • the present invention relates to an electrolytic treatment apparatus suitable for providing a rough surface on a metal web by using an AC current, and particularly relates to an electrolytic treatment apparatus for producing a printing-plate support constituted by a rough-surfaced aluminum plate to be used as an offset printing plate.
  • Aluminum plates have been used as printing-plate supports, particularly, as planographic printing plate supports. Such aluminum plates have been diversified from an aluminum plate formed of substantially pure aluminum to an aluminum plate in which manganese is added to increase the strength of the aluminum plate corresponding to different user applications.
  • an aluminum plate As a planographic printing plate support, it is necessary that the aluminum plate have a proper adhesion property to a photosensitive material and a proper water-retention property.
  • a mechanical graining method there are, for example, a ball graining method, a wire graining method, a brush graining method, a liquid horning method, and the like.
  • an electrochemical graining method on the other hand, an AC electrolytic etching method has been generally employed. In this case, an electric current of an ordinary sinusoidal waveform, or a special waveform, such as a square waveform, has been used.
  • a chemical etching treatment or oilremoving treatment with alkaline solution such as sodium hydroxide or sodium silicate may be performed.
  • Japanese Patent Examined Publication No. Sho. 61-48596 discloses an electrolytic treatment apparatus which is characterized in that a circuit for an auxiliary counter electrode is connected in parallel to a circuit connected to main counter electrodes, and a diode for controlling an anode current flowing in the main counter electrodes, or a mechanism functioning as such a diode, are provided in the circuit for the auxiliary counter electrode.
  • the electrolytic treatment apparatus has such a configuration as shown in Figure 2, in which a metal web 1, that is, a material to be treated, is supported on the circumference of a radial drum roller 2, and a clearance between the metal web 1 and each of the main counter electrodes 3a and 3b disposed in opposition to the metal web 1 is filled with an electrolytic treatment solution 5 containing metal ions in a manner so that the electrolytic treatment solution 5 is supplemented from an electrolyte supply inlet 4 and discharged from an electrolyte discharge outlet 6 to thereby form an electrolyte path 15.
  • An AC current is supplied through electrolyte path 15 from an AC power source to the main counter electrodes 3a and 3b so as to perform electrochemical treatment.
  • the counter electrodes opposed to the metal web 1 are constituted by the main counter electrodes 3a and 3b and the auxiliary counter electrode 8; a circuit for the auxiliary counter electrodes 8 and a circuit for making an anode current flow into the main counter electrodes are connected in parallel to a circuit connected to the main counter electrodes 3a and 3b, and a diode 9 for controlling the anode current flowing in the main counter electrodes or a mechanism functioning as such a diode is provided in the circuit for the auxiliary counter electrode 8 so that currents are made to flow in those circuits.
  • the treatment solution at the metal web 1 side is not sufficiently mixed with the treatment solution at the side of the counter electrodes 3a and 3b so that the difference in degree of fatigue of the component of the treatment solution between at the metal web side and the counter electrodes side, as well as the temperature difference therebetween, are significant. As a result, unevenness is caused in graining, that is, the electrolytic quality is lowered and the electrolysis efficiency is reduced.
  • an electrolytic treatment apparatus for performing electrolytic treatment continuously on a metal web in an electrolytic treatment solution containing metal ions while supplying an AC current across the metal web and counter electrodes, characterized in that one or more electrolyte discharge outlets and one or more electrolyte supply inlets are provided between main counter electrodes.
  • the provision of one or more electrolyte discharge outlets and one or more electrolyte supply inlets between the main counter electrodes according to the present invention includes, for example, the provision of one electrolyte discharge outlet and three electrolyte supply inlets, the provision of two electrolyte discharge outlets and three electrolyte supply inlets, and, of course the provision of electrolyte discharge outlets and electrolyte supply inlets which are equal in number to each other.
  • the flowing-in/out quantity of the electrolyte treatment solution in the electrolyte path increases. Accordingly, even if the original quality of electrolyte treatment solution is fixed, supplied, and discharged while being circulated, the surface of the metal web existing in the electrolyte path has many opportunities to contact fresh electrolyte treatment solution by mixing and agitating the electrolyte treatment solution during the circulation in comparison with the conventional apparatus. As a result, the grain is made uniform and fine, and the electrolysis efficiency is improved. Further, if fresh electrolyte treatment solution is added to the electrolyte treatment solution to be supplied, it is possible to significantly promote the electrolyte reaction.
  • the length of the electrolyte path therebetween is shortened so that the resistance of the path against the flow of solution can be reduced, and the rate of flow of the treatment solution in the path can be made large in comparison with the conventional apparatus to thereby make it possible to further promote the electrolytic reaction.
  • the grain formed by electrolytic surface-roughing can be made uniform and fine to raise the electrolysis efficiency of the electrolyte treatment apparatus to thereby make it possible to increase speed.
  • FIG. 1 shows an embodiment of the electrolytic treatment apparatus according to the present invention.
  • Reference numeral 1 designates a metal web
  • reference numeral 2 designates a radial drum roller for supporting the web 1.
  • the metal web 1 is running while keeping a fixed clearance between the metal web 1 and each of main counter electrodes 3a and 3b and a auxiliary counter electrode 8. Usually, it is suitable to select the clearance to be about 3 - 50 mm.
  • the charging rate of the main counter electrodes to the auxiliary counter electrode varies in accordance with required electrolytic etching conditions.
  • Reference numeral 7 designates an AC power source. Usually, an AC power source having a frequency of 0.1 - 500 Hz is used as the AC power source 7.
  • the frequency is changed in accordance with a required etching mode, deterioration of the main counter electrodes 3a and 3b is large if the frequency is detected to be not higher than 15 Hz, and is remarkably large particularly in case of carbon electrodes.
  • the waveform although various waveforms can be used, it is also possible to use a special alternating waveform as described in Japanese Patent Examined Publications No. Sho. 56-19280 and Sho. 55-19191.
  • Reference numeral 9 designates a diode for controlling a current flowing in the auxiliary counter electrode 8.
  • the material of the auxiliary counter electrode 8 it is preferable to use platinum or Ferrite which is durable against deterioration.
  • an electrolyte supply inlet 4b is provided at the boundary between the main counter electrodes 3a and 3b in addition to, for example, a conventional electrolyte supply inlet 4a.
  • An electrolytic treatment solution 5 comes into the electrolyte supply inlets 4a and 4b, comes further into respective cavities 13 so as to be distributed uniformly over the whole in the direction of width of the radial drum roller 2, through corresponding distributors 12, and then is injected into an electrolyte path 15 through corresponding slits 14.
  • electrolyte supply inlet is provided between the counter electrodes in Figure 1
  • one or more electrolyte supply inlets may be provided between the counter electrodes, and the position and structure of the electrolyte supply inlet are not limited to this embodiment.
  • an electrolyte discharge outlet 6a is provided in front of the electrolyte supply inlet 4b corresponding to the electrolyte supply inlet 4a in addition, for example, to the conventional electrolyte discharge outlet 6.
  • the electrolytic treatment solution 5 comes into a cavity 16 fully extended in the widthwise direction from the electrolyte path 15 so as to be discharged collectively through a discharge pipe 17.
  • electrolyte discharge outlets correspond to the electrolyte supply inlets in Figure 1
  • the electrolytic treatment solution supplied through a large number of supply inlets may be collectively discharged through one discharge outlet or through a plurality of discharge outlets.
  • the important point is that the flowing-in/out quantity of the electrolytic treatment solution is increased by providing one or more electrolyte discharge outlets and one or more electrolyte supply inlets.
  • the electrolytic treatment solution was supplied at 3000 l/min in sum, that is, at 2500 l/min through the electrolyte supply inlet 4a, and at 500 l/min through the electrolyte supply inlet 4b, while the electrolytic treatment solution was discharged at 800 l/min through the electrolyte discharge outlet 6a and at 2200 l/min through the electrolyte discharge outlet 6b.
  • treatment was performed under the same conditions as that in the Example-1.
  • the upper limit of the rate of supply of the electrolytic treatment solution was 2500 l/min, and the inlet nitric acid concentration of 50 g/l was reduced to 40 g/l at the outlet in the vicinity of a metal web because the electrolytic treatment solution could not be uniformly mixed.
  • the outlet temperature in the vicinity of the metal web was 68°C while the inlet temperature of 60°C. As a result, the products became non-conforming ones because of uneven grains.
  • one or more electrolyte discharge outlets and one or more electrode supply inlets are provided between the main counter electrodes so that the concentration and temperature of the electrolytic treatment solution at the inlets and at the outlets can be made close to each other.
  • uniformity and fineness in grains can be maintained and electrolysis efficiency can be raised to thereby make it possible to improve the production speed.
  • the present invention improves quality and reduces the cost of products.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP90104624A 1989-03-14 1990-03-12 Dispositif de traitement électrolytique Expired - Lifetime EP0387750B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59749/89 1989-03-14
JP1059749A JP2549557B2 (ja) 1989-03-14 1989-03-14 電解処理装置

Publications (2)

Publication Number Publication Date
EP0387750A1 true EP0387750A1 (fr) 1990-09-19
EP0387750B1 EP0387750B1 (fr) 1994-02-02

Family

ID=13122201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104624A Expired - Lifetime EP0387750B1 (fr) 1989-03-14 1990-03-12 Dispositif de traitement électrolytique

Country Status (4)

Country Link
US (1) US5094733A (fr)
EP (1) EP0387750B1 (fr)
JP (1) JP2549557B2 (fr)
DE (1) DE69006378T2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995021952A1 (fr) * 1994-02-15 1995-08-17 Ecograph Ag Procede et dispositif de depot electrolytique d'un revetement superficiel de pieces
EP0737594A2 (fr) * 1995-04-10 1996-10-16 Sun Chemical Corporation Procédé de traitement de surfaces de précurseurs pour plaques d'impression lithographiques
EP0730979A3 (fr) * 1995-03-06 1997-08-20 Fuji Photo Film Co Ltd Support pour plaques lithographiques, procédé de fabrication de ces plaques et appareil pour le grainage électrochimique
EP1031648A1 (fr) * 1999-02-24 2000-08-30 Fuji Photo Film Co., Ltd. Procédé et dispositif pour le traitement électrolytique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5314607A (en) * 1991-06-21 1994-05-24 Fuji Photo Film Co., Ltd. Apparatus and method for anodizing supports for lithographic printing plate
FR2733176B1 (fr) 1995-04-19 1997-06-27 Sidel Sa Dispositif pour fabriquer des recipients en une matiere thermoplastique par soufflage ou etirage-soufflage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129338A2 (fr) * 1983-05-19 1984-12-27 Fuji Photo Film Co., Ltd. Procédé de traitement électrolytique
EP0140474A1 (fr) * 1983-10-07 1985-05-08 Kawasaki Steel Corporation Dispositif à contre-courant pour appareil galvanoplastique
FR2586037A1 (fr) * 1985-08-12 1987-02-13 Centro Speriment Metallurg Dispositif a cellule radiale pour le placage electrolytique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2619821A1 (de) * 1976-05-05 1977-11-17 Hoechst Ag Verfahren und vorrichtung zur kontinuierlichen elektrolytischen behandlung eines metallbandes
JPS5980791A (ja) * 1982-10-27 1984-05-10 Sumitomo Metal Ind Ltd ストリツプの近接電解装置
JPS6017098A (ja) * 1983-07-08 1985-01-28 Nippon Steel Corp 帯鋼の電解処理方法
JPS6063391A (ja) * 1983-09-19 1985-04-11 Hitachi Ltd ストリツプの表面処理装置
JPS63266090A (ja) * 1987-04-23 1988-11-02 Kawasaki Steel Corp ストリツプの電気めつき設備

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129338A2 (fr) * 1983-05-19 1984-12-27 Fuji Photo Film Co., Ltd. Procédé de traitement électrolytique
EP0140474A1 (fr) * 1983-10-07 1985-05-08 Kawasaki Steel Corporation Dispositif à contre-courant pour appareil galvanoplastique
FR2586037A1 (fr) * 1985-08-12 1987-02-13 Centro Speriment Metallurg Dispositif a cellule radiale pour le placage electrolytique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995021952A1 (fr) * 1994-02-15 1995-08-17 Ecograph Ag Procede et dispositif de depot electrolytique d'un revetement superficiel de pieces
US5716509A (en) * 1994-02-15 1998-02-10 Ecograph Ag Process and device for the electrolytic surface coating of workpieces
EP0730979A3 (fr) * 1995-03-06 1997-08-20 Fuji Photo Film Co Ltd Support pour plaques lithographiques, procédé de fabrication de ces plaques et appareil pour le grainage électrochimique
US5837345A (en) * 1995-03-06 1998-11-17 Fuji Photo Film Co., Ltd. Support for lithographic printing plate, process for the preparation thereof and electrochemical roughening apparatus
EP0737594A2 (fr) * 1995-04-10 1996-10-16 Sun Chemical Corporation Procédé de traitement de surfaces de précurseurs pour plaques d'impression lithographiques
EP0737594A3 (fr) * 1995-04-10 1998-01-07 Sun Chemical Corporation Procédé de traitement de surfaces de précurseurs pour plaques d'impression lithographiques
EP1031648A1 (fr) * 1999-02-24 2000-08-30 Fuji Photo Film Co., Ltd. Procédé et dispositif pour le traitement électrolytique
US6325912B1 (en) 1999-02-24 2001-12-04 Fuji Photo Film Co., Ltd. Apparatus and method for electrolytic treatment

Also Published As

Publication number Publication date
DE69006378T2 (de) 1994-05-11
DE69006378D1 (de) 1994-03-17
EP0387750B1 (fr) 1994-02-02
US5094733A (en) 1992-03-10
JPH02240300A (ja) 1990-09-25
JP2549557B2 (ja) 1996-10-30

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